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I would suggest that the student consider the following options.
When finding the singular possessive case, we typically add "apostrophe s."
Consider the following examples:
man: I saw the man's foot.
woman: I heard the woman's child.
child: I smelled the child's diaper.
sheriff: I saw the sheriff's badge.
estimate: We could not determine the estimate's emphasis.
object: I saw the object's gleam.
mortal: He experienced a mortal's fate.
affectation: We did not ...